Burr masher



May 9, 1944.

F, D. DOLAN BURR MASHER Filed May 9, 1941 2 Sheets-Sheet 1 May 9, 1944.

BURR MASHER Filed May 9, 1941 '2 Sheets-Shet 2 F. D. DOLAN 7 PatentedMay 9, 1944 BURR MASHER Francis Daniel Dolan, Dundalk, Md.,

assignor to Bethlehem Steel Company, a corporation of PennsylvaniaApplication May 9, 1941, Serial No. 392,739

1 Claim.

This invention relates to a device or apparatus for treating the edgesof sheet or strip metal, and particularly to a device or apparatus forflattening or mashing the edges of cut strips of steel or other metal toremove roughnesses or burrs caused by the operation of a prior cuttingdevice.

It is well known that trimming the edges of cold rolled steel strip andthe like in a rotary or similar shear, especially if the shear issomewhat dull, is apt to produce a slight burr on the sheared surfaces.Heretofore this objectionable surface defect has been eliminated in oneof two ways,

by filing or by edge rolling. Filing has been done by means of a filingboard consisting of a narrow plate on which are fixed a number of smallrectangular files kept in contact with the edge of the strip by springs,while in edge rolling suitably grooved rolls revolving on their verticalaxes are used to produce the required edge.

One object of my invention is to lessen the friction of these previousarrangements, which causes a needless and wasteful expenditure of power.

Another object of my invention is to provide a more rapid and efiicientmeans of removing burr from the edges of metal strip or the like.

Another and further object is to provide a burr masher which is quicklyand easily adjustable for different widths and gages of strip.

Still other objects, purposes and advantages of my invention will appearin the following specification and claim.

With this general description of my invention,

I shall now, in order to make the same more clear, refer to the annexedtwo sheets of drawings forming a part of this specification and in whichlike characters of reference indicate like parts.

Figure 1 is a diagrammatic top plan view illustrating the operatingposition of my burr masher in relation to the feeding, levelling andshearing apparatus;

Fig. 2 is a vertical longitudinal section taken On I the line 2-2 ofFig. 1;

Fig. 3 is a side elevation of my burr mashing apparatus showing thestrip and a portionof the side frame in section;

Fig. 4 is a vertical section through the journal bearings and supportingframe for the roller shafts associated with the burr masher taken on theline #4 of Fig.5;

Fig. 5 is a transverse section view taken on the line 5-5 of Fig. 4-;and

Fig. 6 is a detail section view of one of the burr masher rollersillustrating the manner of adjustably attaching it to its supportingarbor.

In the particular application of my invention which I have illustrated,with special reference to Figs. 1 and 2, coil of strip I mounted onrotatable uncoiling-device or mandrel 2 and directed by guide plates 3is fed through shear rolls 4 which trim the strip to length. Thence thestrip passes between the tapered rollers 5 and 6 and bottom roll 1 ofthe burr masher. Said tapered rollers 5 and 6 bend down andflatten burrson the side edges of the strip against said bottom roll 1 withoutchanging the cross section of the strip. The strip passes thence betweenlevellin rolls 8 on leveller frame 9, and is then cut into sheets by ashear consisting of knife blades I0 mounted in two revolving drums H,dropping finally onto moving belts l2 driven by rollers I3 which removethe sheets for inspection and sortmg.

The burr masher proper, shown in more complete detail in Figures 3 to 6,inclusive, comprises an edging or flattening device mounted on levellerframe 9 by face plates ll bolted or otherwise suitably fastened to theleveller frame at each inner side thereof. Side frames l5 formed in aU-shape with the opening upward enclose and support bearing boxes I6 andI1, provided with grease holes I8 and glands I 9, in the upper one ofwhich on each side on ball bearings 20 is joumaled a horizontal shaft orarbor 2| provided with a key way 22. In the lower bearing boxes I! onball bearings 23 on each side beneath the arbor 2| is journaled bottomroll. 1 over which the strip passes. Across the top of each side frameI5 is fastened flat strap or member 24, and spring 25 and spring seat 26are adjustable to give the degree of pressure desired on the strip bypressscrew 2'! threaded in strap 24. Rollers 5 and 6 tapered veryslightly at 28 to avoid marking the strip are held in position in thekeyway 22 on the shaft by keys 29, and are adjustably movable along theshaft for the sheared width of strip, being held in adjustment byset-screws 30. Bottom roll 1 is vertically adjustable by press-screw 3|.It should be noted that the taper at 28, which consists in a slight,diminution in the enlarged middle portion of the roller longitudinallytoward the center of the shaft or arbor 2|, on a roller 4 inches longand 3.5 inches in largest diameter for strip .010 or lighter gage, suchas is used for tin plate, is of the order of .008 inch or an angle fromhorizontal about one-half of a degree or less and is therefore too smallfor effective illustration.

I have herein shown the strip as pulled through the rollers by levellingrolls 8, which in turn are "essential scope and spirit.

Having thus described my invention, what I claim as new and useful anddesire to secure by Letters Patent is:

A burr masher like, comprising a. pair 01' supports relative to whichthe strip is led, a U-shaped side frame secured to each support, bearingboxes slidably for moving metal strip or the I mounted in each sideframe, an arbor journaled in the upper bearing box on each side, akeyway on the arbor, adjustable rollers having a slight inward taperkeyed to the keyway on the arbor and rotated by frictional contact withthe moving strip, a bottom roll iournaled in the lower bearing'boxes, ametal strap fastened across the top of each side frame, a coil springbeneath each strap for holding the bearing boxes in position, a pressscrew threaded through each strap for adjusting the pressure or thespring, and a second press-screw threaded through the bottom of eachside frame for vertically adjusting each lower bearing box.

FRANCIS DANIEL DOLAN.

